问题
单项选择题
A plane traveled k miles in the first 96 minutes of flight time. If it completed the remaining 300 miles of the trip in t minutes, what was its average speed, in miles per hour, for the entire trip ?()
A.A
B.B
C.C
D.D
E.E
答案
参考答案:A
解析:
考生在做此题时,一定要注意单位的一致,先算出以英里/分钟为单位的平均速度,再把此速度乘以60。该飞机飞行的总距离为k+300英里,总时间为(96+t)分钟,所以根据题意可得其整个旅程的平均速度为[*]。